2. 外语
  3. Thirteen hundred medical professionals, all of which have been trained to treat drug dependency, attended the annual convention

Thirteen hundred medical professionals, all of which have been trained to treat drug dependency, attended the annual convention

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问题 Thirteen hundred medical professionals, all of which have been trained to treat drug dependency, attended the annual convention sponsored by a society
选项 A、Thirteen hundred
B、all of which
C、attended
D、sponsored
答案B
解析 句子大意为：有1300个医学专家参加了一个协会发起的年度大会，他们全部经过医治药物依赖症的训练。本题考查关系代词的用法。在引导非限制性定语从句时，如果指代对象为人，则应使用whom。故all of which应改为all of whom。所以，正确答案是B。
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